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GMC V6 and V12 Engines Engine repair and rebuilding

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  #11  
Old May 7th, 2023, 03:33 PM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by BobBray View Post
I found this one for an older Pontiac, but the outlet is more vertical:

https://www.rockauto.com/en/moreinfo...10337&jsn=1638
Hi! What vehicle did you look up for this?
Thanks.
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  #12  
Old May 7th, 2023, 03:43 PM
James James is online now
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Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by Sabesimpson View Post
Hi! What vehicle did you look up for this?
Thanks.
According to Rock Auto it fit:

PONTIAC ACADIAN 1968-1971
PONTIAC BONNEVILLE 1959-1970
PONTIAC CATALINA 1959-1970
PONTIAC FIREBIRD 1967-1969
PONTIAC GRAND PRIX 1962-1970
PONTIAC GTO 1964-1970
PONTIAC LEMANS 1966-1970
PONTIAC TEMPEST 1961-1970
PONTIAC VENTURA 1960-1961

With a 389 cid or the 400 cid engine.

I don't know if it will fit the GMC V6.
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  #13  
Old May 8th, 2023, 04:37 AM
BobBray BobBray is offline
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Default Re: Thermostat housing / water outlet

It all depends on which water crossover you have. The later Pontiac thermostat housing with the wider bolt spacing fits my '67 351.
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  #14  
Old May 8th, 2023, 04:52 AM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Thanks! My cross over has the housing sitting on top at this point if vertical I will try to Mach up a hose. I just need the 3” in center bolt holes
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  #15  
Old May 8th, 2023, 05:00 AM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Here is a shot of the cross over
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  #16  
Old May 16th, 2023, 01:35 AM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Update….. I was able to match up a housing at NPD in Ventura!
Now I found an oil leak coming from up top and running down the top of the bell housing. Smh
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  #17  
Old May 16th, 2023, 08:16 AM
Prowbar Prowbar is offline
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Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by Sabesimpson View Post
Update….. I was able to match up a housing at NPD in Ventura!
Now I found an oil leak coming from up top and running down the top of the bell housing. Smh
Good job on the housing.

Some thoughts regarding oil leaks:
1. Rear freeze plug in the camshaft bore... Inaccessible unless you have the motor out. Had this on my old 305E.
2. Valley cover gasket. Easy to replace.
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  #18  
Old May 16th, 2023, 09:48 PM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Thanks! The investigation starts tonight!
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  #19  
Old May 18th, 2023, 02:33 AM
Sabesimpson Sabesimpson is offline
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Default Re: Thermostat housing / water outlet

Prowbar,
Investigation complete! You were correct rear freeze plug @ camshaft bore. Oddly, it looks like someone replaced it. Guess i will be pulling the motor sooner then i wanted.
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  #20  
Old May 18th, 2023, 08:24 AM
Prowbar Prowbar is offline
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Default Re: Thermostat housing / water outlet

Quote:
Originally Posted by Sabesimpson View Post
Prowbar,
Investigation complete! You were correct rear freeze plug @ camshaft bore. Oddly, it looks like someone replaced it. Guess i will be pulling the motor sooner then i wanted.
Interesting. One check you can do before pulling the engine is to check if the camshaft drain hole is clear.

In the last cam journal, the closest one to the freeze plug, there is a small hole drilled (about .150") longitudinally in the journal to relieve the oil that gets trapped behind the camshaft galley and freeze plug. These can also get clogged with sludge and junk.

Remove the intake manifold and valley cover, then turn the engine so the drain hole is facing upwards. With a small screwdriver or drill bit, you should be able to poke it through.

Having it clogged or at least, close to clogged, build up excessive pressure causing the freeze plug to leak.

Hope this helps.
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